TV Guide reports that Nickelodeon's Teenage Mutant Ninja Turtles animated series will return with new episodes starting Friday, January 25, 7/6c with "I, Monster," an episode that introduces a fan favorite villain, The Rat King. Nickelodeon will air a Ninja Turtles marathon that night as part of its "Total Turtle Takeover." After that, new episodes will premiere in the show's regular time slot, Saturdays at 11am/10c.

TV Guide also reports that Roseanne Barr will be voicing a new character called Kraang Prime who will debut in the season finale. Corey Feldman will also be voicing a character this season.